Introduction

This 40- to 50-foot-tall deciduous tree creates a dense, rounded canopy of spreading, twisted branches, but is not cultivated in nurseries. The 4- to 6-inch-long by 3- to 4-inch-wide, shiny, dark green leaves are deeply lobed and appear somewhat in the shape of a Maltese cross. Only rarely do the leaves change to a golden brown in the fall before dropping. The one-half to one-inch-long acorns are quite popular with squirrels and other wildlife. Old trees growing on good soil form a wonderful silhouette in the winter, with large-diameter, curving branches growing from a sinuous trunk.

Culture

Other

Roots: not a problem

Winter interest: yes

Outstanding tree: no

Ozone sensitivity: unknown

Verticillium wilt susceptibility: resistant

Pest resistance: resistant to pests/diseases

Use and Management

Most often found on dry, low-fertility, sandy soils, post oak is extremely drought-tolerant. Trees should be located in full sun. Native trees are very sensitive to soil compaction, drainage changes and soil disturbance. Do not disturb the soil beneath the canopy on a construction site if the tree is to be saved.

Propagation is by seed.

Pests and Diseases

No pests or diseases of major concern but the tree occasionally succumbs to chestnut blight. There are many other potential problems on oaks but none are normally serious. Post oak is susceptible to oak wilt.

Footnotes

1.

This document is ENH-720, one of a series of the Environmental Horticulture Department, UF/IFAS Extension. Original publication date November 1993. Revised December 2006. Reviewed February 2014. Visit the EDIS website at http://edis.ifas.ufl.edu.

The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. For more information on obtaining other UF/IFAS Extension publications, contact your county's UF/IFAS Extension office.

U.S. Department of Agriculture, UF/IFAS Extension Service, University of Florida, IFAS, Florida A & M University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Nick T. Place, dean for UF/IFAS Extension.